Alert archive / Virginia / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 159
The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2004, 7:20 PM EDT for 16 counties in Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 7, 2004, 7:20 PM EDT (23:20 UTC)
- Expired
- May 7, 2004, 11:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Accomack County, VA, Caroline County, VA, City of Richmond, VA, Essex County, VA, Gloucester County, VA, Hanover County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Richmond County, VA, Spotsylvania County, VA, Westmoreland County, VA
The radar
The Norfolk radar (KAKQ), 99 km from the middle of the area, began a volume at 23:22 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | Orange, Spotsylvania, City of Fredericksburg | 39 min |
| May 7, 7:24 PM EDT | Severe Thunderstorm Warning | AKQ | Caroline | 36 min |
| May 7, 7:51 PM EDT | Severe Thunderstorm Warning | AKQ | Essex, Richmond, Westmoreland | 39 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.3 hours before the alert went out and 130 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 28 J/kg
- Mixed-layer CIN
- -314 J/kg
- Mixed-layer LCL
- 1566 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 10:29 AM EDT | Mesoscale Discussion | SPC | Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 14 more | 91 min |
| May 7, 11:00 AM EDT | Severe Thunderstorm Watch | SPC | Arlington, Clarke, Frederick, Loudoun, Shenandoah, Warren and 3 more | 6 hr |
| May 7, 1:49 PM EDT | Mesoscale Discussion | SPC | Clarke, Frederick, Loudoun, Shenandoah, Warren, City of Winchester | 86 min |
| May 7, 4:35 PM EDT | Severe Thunderstorm Watch | SPC | Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 21 more | 5 hr |
| May 7, 6:17 PM EDT | Mesoscale Discussion | SPC | Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 20 more | 118 min |
| May 7, 7:02 PM EDT | Mesoscale Discussion | SPC | Caroline, Essex, Fluvanna, Gloucester, Goochland, Hanover and 13 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2004Every severe thunderstorm watch in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.